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US 2025/0144562 A1Published application
Electrochemical co2 capture with air stable redox species
AssigneePresident and Fellows of Harvard College
InventorsYan JING, Shijian JIN, Roy G. GORDON, Michael J. AZIZ
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Abstract
The invention features solutions of water-soluble, oxygen-resistant redox-active species circulated in flow cells to electrochemically capture CO2 from air or flue gas and release pure CO2. The method is safe, scalable, and potentially inexpensive, as it utilizes non-volatile and potentially low-cost redox organic and inexpensive inorganic species and can operate at ambient temperature and pressure and can operate at high current densities.
Claims18
A method for capturing CO2 comprising:
- a) providing an electrochemical cell comprising a redox-active species dissolved or dispersed in aqueous solution;
- b) electrochemically reducing the redox-active species to a reduced state;
- and
- c) contacting a mixture of gases comprising CO2 with the aqueous solution;
- wherein the redox-active species comprises an aromatic redox core and one or more substituents which increase resistance of the reduced state to oxidation by oxygen or wherein a redox potential of the redox-active species and its reduced state is stable to oxidation by oxygen.
2 more elements
Dependencies are inferred from the claim text.